Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes
Austenitic stainless steels (ASSs) are widely used for nuclear pipes as they exhibit a good combination of mechanical properties and corrosion resistance. However, high tensile residual stresses may occur in ASS welds because postweld heat treatment is not generally conducted in order to avoid sensi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2016-12-01
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| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573316300870 |
| _version_ | 1818998058788061184 |
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| author | Chang-Gi Han Yoon-Suk Chang Jong-Sung Kim Maan-Won Kim |
| author_facet | Chang-Gi Han Yoon-Suk Chang Jong-Sung Kim Maan-Won Kim |
| author_sort | Chang-Gi Han |
| collection | DOAJ |
| description | Austenitic stainless steels (ASSs) are widely used for nuclear pipes as they exhibit a good combination of mechanical properties and corrosion resistance. However, high tensile residual stresses may occur in ASS welds because postweld heat treatment is not generally conducted in order to avoid sensitization, which causes a stress corrosion crack. In this study, round robin analyses on stress intensity factors (SIFs) were carried out to examine the appropriateness of structural integrity assessment methods for ASS pipe welds with two types of circumferential cracks. Typical stress profiles were generated from finite element analyses by considering residual stresses and normal operating conditions. Then, SIFs of cracked ASS pipes were determined by analytical equations represented in fitness-for-service assessment codes as well as reference finite element analyses. The discrepancies of estimated SIFs among round robin participants were confirmed due to different assessment procedures and relevant considerations, as well as the mistakes of participants. The effects of uncertainty factors on SIFs were deducted from sensitivity analyses and, based on the similarity and conservatism compared with detailed finite element analysis results, the R6 code, taking into account the applied internal pressure and combination of stress components, was recommended as the optimum procedure for SIF estimation. |
| first_indexed | 2024-12-20T21:55:30Z |
| format | Article |
| id | doaj.art-224a8fc956d344f8942d9cb6123bad18 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-20T21:55:30Z |
| publishDate | 2016-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-224a8fc956d344f8942d9cb6123bad182022-12-21T19:25:28ZengElsevierNuclear Engineering and Technology1738-57332016-12-014861412142210.1016/j.net.2016.05.006Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel PipesChang-Gi Han0Yoon-Suk Chang1Jong-Sung Kim2Maan-Won Kim3Department of Nuclear Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of KoreaDepartment of Nuclear Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of KoreaDepartment of Mechanical Engineering, Sunchon National University, 255 Jungang-ro, Suncheon-si, Jeollanam-do 540-950, Republic of KoreaCentral Research Institute, Korea Hydro & Nuclear Power Company, 70 Yuseong-daero, 1312 Beon-gil, Yuseong-gu, Daejeon 305-343, Republic of KoreaAustenitic stainless steels (ASSs) are widely used for nuclear pipes as they exhibit a good combination of mechanical properties and corrosion resistance. However, high tensile residual stresses may occur in ASS welds because postweld heat treatment is not generally conducted in order to avoid sensitization, which causes a stress corrosion crack. In this study, round robin analyses on stress intensity factors (SIFs) were carried out to examine the appropriateness of structural integrity assessment methods for ASS pipe welds with two types of circumferential cracks. Typical stress profiles were generated from finite element analyses by considering residual stresses and normal operating conditions. Then, SIFs of cracked ASS pipes were determined by analytical equations represented in fitness-for-service assessment codes as well as reference finite element analyses. The discrepancies of estimated SIFs among round robin participants were confirmed due to different assessment procedures and relevant considerations, as well as the mistakes of participants. The effects of uncertainty factors on SIFs were deducted from sensitivity analyses and, based on the similarity and conservatism compared with detailed finite element analysis results, the R6 code, taking into account the applied internal pressure and combination of stress components, was recommended as the optimum procedure for SIF estimation.http://www.sciencedirect.com/science/article/pii/S1738573316300870Finite Element AnalysesFitness-for-Service Assessment CodesInner Surface CrackStress Intensity FactorWelding Residual Stress |
| spellingShingle | Chang-Gi Han Yoon-Suk Chang Jong-Sung Kim Maan-Won Kim Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes Nuclear Engineering and Technology Finite Element Analyses Fitness-for-Service Assessment Codes Inner Surface Crack Stress Intensity Factor Welding Residual Stress |
| title | Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes |
| title_full | Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes |
| title_fullStr | Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes |
| title_full_unstemmed | Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes |
| title_short | Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes |
| title_sort | round robin analyses on stress intensity factors of inner surface cracks in welded stainless steel pipes |
| topic | Finite Element Analyses Fitness-for-Service Assessment Codes Inner Surface Crack Stress Intensity Factor Welding Residual Stress |
| url | http://www.sciencedirect.com/science/article/pii/S1738573316300870 |
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